Seat Switch
The seat switch is normally open and closes when the
operator seat is occupied. This switch is used as an in-
put for the TEC controller. If the traction system or PTO
switch is engaged when the operator raises out of the
seat, the engine will stop. The seat switch is located di-
rectly under the operator seat.
1
Testing
1.
Before disconnecting the seat switch for testing, the
switch and its circuit wiring should be tested as a TEC
controller input with the Diagnostic Display (see Diag-
nostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the seat
switch andcircuit wiring arefunctioning correctly,nofur-
ther switch testing is necessary. If, however, the Diag-
nostic Display determines that the seat switch and
circuit wiring are not functioning correctly, proceed with
test procedure.
2
Figure 27
2.
1.
Seat switch lead
Electrical connector
2.
3.
the seat switch electrical lead near the operator manual
tube under the operator seat (Fig. 27).
Make sure ignition switch is in the OFF position.
Disconnect wire harness electrical connector from
4
4.
Check the continuity of the switch by connecting a
multimeter (ohms setting) across the switch connector
terminals.
1
2
3
5.
continuity (open) between the seat switch terminals.
With no pressure on the seat, there should be no
6.
Press directly onto the seat switch through the seat
cushion. There should be continuity (closed) as the seat
cushion approaches the bottom of its travel.
7.
Seat Removal in the Service and Repairs section of
Chapter 6 -- Chassis).
If seat switch is faulty, replace switch (see Operator
Figure 28
8.
Ifthe seatswitch tests correctly andacircuitproblem
1.
2.
Operator seat
Seat switch
3.
4.
Screw (2 used)
Seat wire harness
still exists, check wire harness (see Electrical Schemat-
ic and Circuit Drawings in Chapter 8 -- Foldout Draw-
ings).
9.
Connect wire harness electrical connector to the
seat switch electrical lead.
Groundsmaster 4300--D
Page 5 -- 27
Electrical System
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